On 2007-07-18 05:49, Hugh Dickins wrote:
> On Wed, 18 Jul 2007, Joe Jin wrote:
> >
> > With your patch, I have reproduced the panic:
>
> That is... surprising to me. (I hadn't been able to reproduce it with
> or without the patches: maybe I just need to try harder.) Please post
> your gcc --version, and the disassembly (objdump -d) output for
> alloc_fresh_huge_page.
>
It will easy to reproduce, just run following scripts on *2* difference
terminal at the same time, I think you will hit it in a short time.
#!/bin/bash
while : ; do
echo 1000000000000 > /proc/sys/vm/nr_hugepages
echo 1 > /proc/sys/vm/nr_hugepages
echo 10000000000000000000 > /proc/sys/vm/nr_hugepages
echo 0 > /proc/sys/vm/nr_hugepages
done
# gcc --version
gcc (GCC) 4.1.1 20070105 (Red Hat 4.1.1-52)
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
------------------------------------------------------------------------------------------------------------------------
Disassembly alloc_fresh_huge_page with gdb:
0xffffffff810719cf <alloc_fresh_huge_page+0>: mov 3651606(%rip),%r8d # 0xffffffff813ed1ec <prev_nid.16422>
0xffffffff810719d6 <alloc_fresh_huge_page+7>: mov 2841027(%rip),%rdi # 0xffffffff813273a0 <node_online_map>
0xffffffff810719dd <alloc_fresh_huge_page+14>: mov $0x3f,%eax
0xffffffff810719e2 <alloc_fresh_huge_page+19>: push %rbx
0xffffffff810719e3 <alloc_fresh_huge_page+20>: lea 0x1(%r8),%esi
0xffffffff810719e7 <alloc_fresh_huge_page+24>: sub %r8d,%eax
0xffffffff810719ea <alloc_fresh_huge_page+27>: mov %rdi,%rdx
0xffffffff810719ed <alloc_fresh_huge_page+30>: cltq
0xffffffff810719ef <alloc_fresh_huge_page+32>: mov %sil,%cl
0xffffffff810719f2 <alloc_fresh_huge_page+35>: shr %cl,%rdx
0xffffffff810719f5 <alloc_fresh_huge_page+38>: bsf %rdx,%rcx
0xffffffff810719f9 <alloc_fresh_huge_page+42>: cmove %rax,%rcx
0xffffffff810719fd <alloc_fresh_huge_page+46>: lea (%rsi,%rcx,1),%ecx
0xffffffff81071a00 <alloc_fresh_huge_page+49>: mov $0x40,%eax
0xffffffff81071a05 <alloc_fresh_huge_page+54>: cmp $0x40,%ecx
0xffffffff81071a08 <alloc_fresh_huge_page+57>: cmovg %eax,%ecx
0xffffffff81071a0b <alloc_fresh_huge_page+60>: cmp $0x40,%ecx
0xffffffff81071a0e <alloc_fresh_huge_page+63>: mov %ecx,3651540(%rip) # 0xffffffff813ed1e8 <nid.16423>
0xffffffff81071a14 <alloc_fresh_huge_page+69>: jne 0xffffffff81071a2f <alloc_fresh_huge_page+96>
0xffffffff81071a16 <alloc_fresh_huge_page+71>: mov $0x40,%eax
0xffffffff81071a1b <alloc_fresh_huge_page+76>: bsf %rdi,%rdx
0xffffffff81071a1f <alloc_fresh_huge_page+80>: cmove %rax,%rdx
0xffffffff81071a23 <alloc_fresh_huge_page+84>: cmp $0x40,%edx
0xffffffff81071a26 <alloc_fresh_huge_page+87>: cmovle %edx,%ecx
0xffffffff81071a29 <alloc_fresh_huge_page+90>: mov %ecx,3651513(%rip) # 0xffffffff813ed1e8 <nid.16423>
0xffffffff81071a2f <alloc_fresh_huge_page+96>: mov 3651507(%rip),%eax # 0xffffffff813ed1e8 <nid.16423>
0xffffffff81071a35 <alloc_fresh_huge_page+102>: test %eax,%eax
0xffffffff81071a37 <alloc_fresh_huge_page+104>: mov %eax,3651503(%rip) # 0xffffffff813ed1ec <prev_nid.16422>
0xffffffff81071a3d <alloc_fresh_huge_page+110>: jns 0xffffffff81071a47 <alloc_fresh_huge_page+120>
0xffffffff81071a3f <alloc_fresh_huge_page+112>: mov %gs:0x30,%eax
0xffffffff81071a47 <alloc_fresh_huge_page+120>: cltq
0xffffffff81071a49 <alloc_fresh_huge_page+122>: mov $0x9,%esi
0xffffffff81071a4e <alloc_fresh_huge_page+127>: mov $0x242d2,%edi
0xffffffff81071a53 <alloc_fresh_huge_page+132>: mov 0xffffffff813260e0(,%rax,8),%rdx
0xffffffff81071a5b <alloc_fresh_huge_page+140>: add $0x1860,%rdx
0xffffffff81071a62 <alloc_fresh_huge_page+147>: callq 0xffffffff8105d4b8 <__alloc_pages>
0xffffffff81071a67 <alloc_fresh_huge_page+152>: mov %rax,%rbx
0xffffffff81071a6a <alloc_fresh_huge_page+155>: xor %eax,%eax
0xffffffff81071a6c <alloc_fresh_huge_page+157>: test %rbx,%rbx
0xffffffff81071a6f <alloc_fresh_huge_page+160>: je 0xffffffff81071ab4 <alloc_fresh_huge_page+229>
0xffffffff81071a71 <alloc_fresh_huge_page+162>: movq $0xffffffff81072a02,0x60(%rbx)
0xffffffff81071a79 <alloc_fresh_huge_page+170>: mov $0xffffffff812e6c68,%rdi
0xffffffff81071a80 <alloc_fresh_huge_page+177>: callq 0xffffffff81217952 <_spin_lock>
0xffffffff81071a85 <alloc_fresh_huge_page+182>: incq 3651428(%rip) # 0xffffffff813ed1f0 <nr_huge_pages>
0xffffffff81071a8c <alloc_fresh_huge_page+189>: mov (%rbx),%rax
0xffffffff81071a8f <alloc_fresh_huge_page+192>: shr $0x2d,%rax
0xffffffff81071a93 <alloc_fresh_huge_page+196>: and $0x3f,%eax
0xffffffff81071a96 <alloc_fresh_huge_page+199>: incl 0xffffffff813ed620(,%rax,4)
0xffffffff81071a9d <alloc_fresh_huge_page+206>: movl $0x1,2576833(%rip) # 0xffffffff812e6c68 <hugetlb_lock>
0xffffffff81071aa7 <alloc_fresh_huge_page+216>: mov %rbx,%rdi
0xffffffff81071aaa <alloc_fresh_huge_page+219>: callq 0xffffffff8105f9cc <put_page>
0xffffffff81071aaf <alloc_fresh_huge_page+224>: mov $0x1,%eax
0xffffffff81071ab4 <alloc_fresh_huge_page+229>: pop %rbx
0xffffffff81071ab5 <alloc_fresh_huge_page+230>: retq
Thanks,
Joe
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